Six Out of Seven Ain't Bad

These brain teasers rely on your ability to recognize groups of common attributes. For each of these puzzles you'll need to figure out why the words or letters are grouped as they are. Sometimes you will be asked to pick the odd-one-out or to place a new word into the correct group.

I got 5 of the 6 very easily. Throgh the process of elineation I knew #4 was either Monday or Thursday and Monday just made more sense to me even though I had never heard of the movie.
Expecting anyone to come up with the missing movie was, in my opinion, unfair for several reasons; first: the movie you used was as you said "unremarkable" and given its age ,it is unlikely anyone but old movie buffs have ever heard of it
Secondly, according to IMDB, there are more than 20 movies that contain the word "Thursday" in the title, including three (3) whose name is simply "Thursday" (1998, 2006 and 2014) .

I'm not a big movie fan. The only 2 I knew for sure were Ash Wednesday and Saturday Night Fever. I guessed at a couple, but guessed wrong. But, I still came up with the right answer! Thursday!! I couldn't ever remember a title with Thursday in it. Dumb luck wins again!